Sending NULL to an Oracle procedure.

How can I send NULL to an Oracle procedure? I have something like this: cs = con.prepareCall ( "{ call myProc( ?, ? )}" ); cs.registerOutParameter( 1, oracle.jdbc.driver.OracleTypes.CURSOR ); if ( myVar.equals( "" ) ) cs.setString( 2, NULL ); else cs.setString( 2, myVar ); To this point I've been unsuccessful in making myVar = NULL so I thought I'd try it this way... Of course, NULL isn't a variable so I can't do it like I showed above... but I shared it with you so you can get an idea of what I'm trying to do. Please help me out... Thanks.